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oscillo.hpp
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oscillo.hpp
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/// Oscilloscope driver
///
/// (c) Koheron
#ifndef __DRIVERS_OSCILLO_HPP__
#define __DRIVERS_OSCILLO_HPP__
#include <chrono>
#include <thread>
#include <cmath>
#include <context.hpp>
constexpr float PI = 3.1415927;
constexpr float SAMPLING_RATE = 125E6;
constexpr uint32_t WFM_SIZE = mem::adc_range/sizeof(float);
constexpr auto wfm_time = std::chrono::nanoseconds(WFM_SIZE * static_cast<uint32_t>(1E9F / SAMPLING_RATE));
constexpr std::array<uint32_t, 2> N_AVG_OFFSET = {reg::n_avg0, reg::n_avg1};
class Oscillo
{
public:
Oscillo(Context& ctx_)
:ctx(ctx_)
,ctl(ctx.mm.get<mem::control>())
, sts(ctx.mm.get<mem::status>())
, adc_map(ctx.mm.get<mem::adc>())
, decimated_data(0)
{
raw_data[0] = adc_map.get_ptr<int32_t>(0);
raw_data[1] = adc_map.get_ptr<int32_t>(1);
set_average(false); // Reset averaging
ctl.write<reg::addr>(19 << 2); // set tvalid delay to 19 * 8 ns
set_num_average_min(0);
set_dac_periods(WFM_SIZE, WFM_SIZE);
set_average_period(WFM_SIZE);
}
void reset() {
ctl.clear_bit<reg::addr, 0>();
ctl.set_bit<reg::addr, 0>();
}
void reset_acquisition() {
ctl.clear_bit<reg::addr, 1>();
ctl.set_bit<reg::addr, 1>();
}
// Averaging
auto get_average_status() {
return std::make_tuple(
is_average,
num_average_min,
num_average
);
}
void set_average(bool is_average_) {
is_average = is_average_;
ctl.write_bit<reg::avg0, 0>(is_average);
ctl.write_bit<reg::avg1, 0>(is_average);
}
uint32_t get_num_average(uint32_t channel) {
num_average = sts.read_reg(N_AVG_OFFSET[channel]);
return num_average;
}
void set_num_average_min(uint32_t num_average_min_) {
num_average_min = (num_average_min_ < 2) ? 0 : num_average_min_-2;
ctl.write<reg::n_avg_min0>(num_average_min);
ctl.write<reg::n_avg_min1>(num_average_min);
}
// Read channels and take one point every decim_factor points
std::vector<float>& get_decimated_data(uint32_t decim_factor, uint32_t index_low, uint32_t index_high) {
// Sanity checks
if (index_high <= index_low || index_high > WFM_SIZE) {
decimated_data.resize(0);
return decimated_data;
}
ctl.set_bit<reg::addr, 1>();
uint32_t n_pts = (index_high - index_low)/decim_factor;
decimated_data.resize(2*n_pts);
_wait_for_acquisition();
is_average = sts.read_bit<reg::avg_on_out0, 0>();
if (is_average) {
float num_average_ = float(get_num_average(0));
for (unsigned int i=0; i<n_pts; i++) {
decimated_data[i] = float(raw_data[0][index_low + decim_factor * i]) / num_average_;
decimated_data[i + n_pts] = float(raw_data[1][index_low + decim_factor * i]) / num_average_;
}
} else {
for (unsigned int i=0; i<n_pts; i++) {
decimated_data[i] = float(raw_data[0][index_low + decim_factor * i]);
decimated_data[i + n_pts] = float(raw_data[1][index_low + decim_factor * i]);
}
}
ctl.clear_bit<reg::addr, 1>();
return decimated_data;
}
private:
int32_t *raw_data[2] = {nullptr, nullptr};
bool is_average;
uint32_t num_average_min;
uint32_t num_average;
Context& ctx;
Memory<mem::control>& ctl;
Memory<mem::status>& sts;
Memory<mem::adc>& adc_map;
// Acquired data buffers
std::vector<float> decimated_data;
// Internal functions
void _wait_for_acquisition()
{
using namespace std::chrono_literals;
auto begin = std::chrono::high_resolution_clock::now();
do {
if (num_average_min > 0) {
auto now = std::chrono::high_resolution_clock::now();
auto remain_wait = ctl.read<reg::n_avg_min0>() * wfm_time - (now - begin);
// If acquisition time is larger than 1 ms, we sleep for the
// typical overhead time to put the thread in sleep (~ 100 us).
if (remain_wait > 1ms)
std::this_thread::sleep_for(remain_wait / 10);
}
} while (sts.read<reg::avg_ready0>() == 0
|| sts.read<reg::avg_ready1>() == 0);
}
void set_dac_periods(uint32_t dac_period0, uint32_t dac_period1) {
ctl.write<reg::dac_period0>(dac_period0 - 1);
ctl.write<reg::dac_period1>(dac_period1 - 1);
reset();
}
void set_average_period(uint32_t average_period) {
ctl.write<reg::avg_period>(average_period - 1);
ctl.write<reg::avg_threshold>(average_period - 6);
reset();
}
};
#endif // __DRIVERS_OSCILLO_HPP__